Logging device



0a. 31, 1939. G. F. COATS 2,178.470

LOGGING DEVICE Filed Dec. 19, 1358 4 Sheets-Sheet l I I ij nucnfoc ai foaiq Oct. 31, 1939.

G. 'F. COATS 2.178.470

LOGGING DEVICE Filed Dec. 19, 1938 4 Sheets-Sheet 2 A g R 2 is g A: $2 I R i 15 H g5 A l ..l

Oct. 31, 15939. G F COATS 2.178.470

LOGGING DEVICE Filed Dec. 19, 1938 Sheets-Sheet 5 Oct. 31, 1939. G. F. COATS 2,178,470

LCGGING DEVICE Patented Get. 31, 1939 UNITED STATES i? FENCE.

12 Claims.

This invention relates to a logging device and more particularly to an improved logging boom.

An object of this invention is to provide a logging boom which is so constructed that the boom may be readily and quickly mounted on a spar tree, the boom including means for elevating or lowering the boom relative to the spar tree in addition to elevating logs relative to the boom.

Another object of this invention is to provide an improved boom structure having a power means mounted thereon, the boom being constructed in the form of a skid so that the boom can be readily shifted from one location to another in a much quicker time than is possible where the power means for the boom is separate from the boom.

A further object of this invention is to provide in a boom structure an outer member which is adapted to be mounted adjacent the inner end or" the boom and means for adjusting the power device relative to the boom so that the power device may be maintained in a horizontal position with the boom at an inclination to the horizontal.

A further object of this invention is to provide an improved power means for elevating and swinging a boom whereby a single boom may be used in varying locations where booms at present in use cannot be used.

A further object of this invention is to provide a combined boom and power unit which is so constructed that the boom can be readily shifted from one side of the spar tree to the other in'a very short space of time irrespective of. the configuration of the ground beyond the end of the boom or on the opposite sides of the spar tree.

A further object of this invention is to provide a combined boom and power unit which can be brought up to the spar tree by the truck, trailer or flat car and promptly set up for operation and conversely may be removed from the spar tree by backing the truck, trailer or flat car up to the spar tree for raising or lowering the boom by the self contained power unit and then removing the rigging secured to the spar tree.

A further object of this invention is to provide a combined boom and power unit so that the logging operations may be carried forward regardless of the rough or limited nature of the ground which with the use of a donkey engine requires the location of the engine at a remote point from the actual logging operation.

A still further object of this invention is to provide a combined boom and power means therefor which is so constructed that it can be quickly set up at the desired location and can also be shifted from one location to another in a much quicker time than is possible with present boom structures, the device being capable of mounting on a trailer so that the boom can be quicklyshifted, the boom being a complete unit in itself so that when the boom is placed on a location the boom is capable of immediate operation.

To the foregoing objects and to others which may hereinafter appear, the invention consists of the novel construction, combination and arrangement of parts as will be more specifically referred to and illustrated in the accompanying drawings wherein is shown an embodiment of the invention, but it is to be understood that changes, variations and modifications may be resorted to which fall within the scope of the invention as claimed.

In the drawings:

Figure 1 is a detail side elevation of a boom constructed according to an embodiment of this invention,

Figure 2 is a detail top plan of the boom,

Figure 3 is a detail top plan of. a modified form of boom structure,

Figure 4 is a detail side elevation of the power means associated with the boom, and

Figure 5 is a detail top plan of the power device.

Referring to the drawings and first to Figures 1 and 2, the numeral Ml designates generally a boom structure which is movably engaged with a vertically disposed spar tree it. The spar tree it is normally topped and guy members it are secured at their upper ends to the spar tree 9 3 at a point adjacent the upper end thereof and are then anchored at suitable points remote from the spar tree l3 so as to prevent the tilting of the tree l8 during the operation of the boom H). I

The boom l8 comprises apair of elongated spaced apart log members 52 which are held in spaced apart relation by means of a plurality of transversely disposed connecting members l4, l5, l6 and H. which are disposed adjacent one end of a pair of boom members l2 and the transverse member ii is positioned adjacent the opposite end of the members 12. The two transverse members I5 and [5 are positioned intermediate the end member Ill and the two members M. Preferably, the two boom members 52 are provided with bevelled or arcuate opposite end portions it which facilitate the dragging of the boom structure it] over the ground.

There are two transversemembers M The boom I 0 is provided with a heeling grid generally designated l9 which comprises a plurality of elongated spaced apart parallel bars 20 which are provided with upturned opposite end portions 2|. These bars 28 are secured to the under sides of. the transverse members l5 and i6 and provide a means whereby the inner or rear end of the log L may contact with the under side of the boom during the raising or lowering operation.

The boom it has secured to the forward end thereof a bridle or elongated member 22 which at its lower end is pivotally secured to a strap 23 engaging the transverse connecting member I! and the upper end of the bridle 22 has a sheave or pulley 2d rotatably carried thereby. A cable or flexible member 25 is trained about the sheave 24 and one end thereof is secured to an upper sheave 536 which fixed as by a fastening means 21 to the spar tree !3 adjacent the upper end of the spar tree. The flexible elevating member 25 is trained over the sheave 2B and is then wound about a rotatable drum 28. The drum 23 forms part of a power member generally designated as P which is secured as will be hereinafter described to the upper side of the boom l0. Rotation of the drum 28 in one direction will raise he forward end of the boom it] and rotation in the opposite direction will lower the boom it. The power member P is provided with a loading drum 2!] about which a loading cable 38 is wound. The loading cable 38 engages through a sheave 3| which is swingably secured to the connecting member ll on the inner side thereof and a grab book 32 is secured to the outer or free end of the cable 38, Where only one cable used the grab hook 32 is adapted to engage the log'L at a point rearwardly of the longitudinal center thereof so that when the log L is raised the rear end thereof will rise first and engage against the under side of the heeling grid is. The forward or outer end of the log L may then be raised so as to position the log L at the desired loading angle. In Figures 1, 2 and 3 there is disclosed a power member P having a single loading drum 25 but it will be understood that two loading drums may be used similar to the load.-- g drums shown in Figure 5 to be hereinafter described.

The rear end of the boom in is elevated or lowered by means of cable or flexible member 33 which at one end thereof is secured to a bridle 34 which is rcclzably secured by pivotal members 35 to the rear end portion of the boom Ill and this cable 33 is trained over a sheave 35 secured as by a fastening means 3i to the upper portion of the spar tree 13. The cable is wound. about an elevating drum 38 carried by the power member P so that the rear portion of the boom I!) may be vertically adjusted to any desired height relative to the ground. The boom if] at the rear portion thereof as shown in Figures 1 and 2 is provided with a transversely disposed heel member 39 which is secured between the two side members if! rearwardly of the rearmost member (4 and this heel member is adapted to contact with the exterior of the spar tree and provides a fulcrum for rocking the outer end of the boom In in addition to swinging the boom Ill horizontally.

The bridle 34 may be constructed of a single U-shaped member which engages on opposite sides of the two side members I 2 of the boom and the free end of the cable is adapted to be connected to the bight of the U-member 34. In order to provide a means whereby the boom l0 may be swung in a horizontal plane in one direction, I have provided a boom swing or slew line or cable 48 which at one end is adapted to be anchored to a stationary member in the form of a stump or tree remote from the spar tree E3. The cable 40 trained about a sheave ii rotatably carried by the boom it"; on one side thereof adjacent the forward end of the boom and the cable 40 is wound about a swing or slew drum 42 which forms part of the power member P. Winding of the cable do about the drum 42 will swing the boom 58 in one direction.

The boom iii may be swung in the opposite direction by means of a second swing or slew cable '53 which trained about a sheave or pulley 44 carried by the opposite side of the boom ID. The cable 43 wound about a second swing or slew drum 55 carried by the power member P and winding of the cable about the drum 45 will swing the boom horizontally in a direction 0pposite from the sin .ging thereof effected by the cable to.

In Figure 3 there is disclosed a slightly modified form of boom structure Hi whic comprises substantially parallel or spaced apart side members ill wl h are held in spaced apart relation by means of transverse members M and H The b n li provided with a heel member 59 sin-alar to the heel member 39, but the heel is positioned at a point forwardly of the heel member 39 so that a considerable portion of each side member will project rearwardly beyond the spar tree 3 The boom H3 is adapted to have associated therewith the elevating members similar to those disclosed in Figures 1 and 2 which are operated by elevating drums and The log L which is raised by the boom it is raised by means of a pair of grab hooks 32 and These grab hooks are secured to a single cable ll? which is trained through sheaves l'i is secured to a clevis A9. The clevis 29 is secured to a log raising cable so which is wound about a loading drum 29 and with th use of the two grab hoclzs 32 and 32 the log L is adapted to be raise in a horizontal position. The boom lzl mounted on one side member l'Z thereof sheave li about which a slew or swing ca le Gi is trained which is wound about slow or swing drum 42 This cable 66* is adapted to be anchored at its free end to a stationary member such as a stake, small tree or the like so that winding of the drum 42 will swing the boom Mi horizontally in one direction.

Where the boom W is mounted in the position where the second slew or or 'ng cable 43 cannot be anchored laterally of the spar tree w opposite from. the point where the cable 49 is anchored the cable 43* adapted to be anchored on the same or even to the same point as the cable M Swinging the boom in a direction opposite from the so. 'ng thereof by means of the caole th is ac plished by mounting a sheave to the 21 end of the boom l0 on side thereof osite from the sheave ll cable 43 wound about a drum th so that wind ng of the cable it on the drum will ow the boom H3 in a horizontal direction opposite from the swinging thereof under the windof the cable It will also be understood that if desired the cable lli may have the sheave *i l thereof to the rear of the boom Ell and this cable th n anchored. to a stationary anchor on the side of spar tree w from the anchoring member for the cable 43 The power member P is mounted on a platform or frame structure 5! and at its forward end is rockably mounted on a shaft 52 carried by a pair of upstanding lugs or plates 53 which are fixedly secured to the forward transverse member M. The platform or frame 5! is maintained in a horizontal position by means of a frame adjusting screw 54 which is threaded through a nut 55 carried by supporting members 56 secured to the rear of the frame 54. The lower end of the adjusting screw St is rockably and swivelly carried by supporting means 51 secured to the rearmost transverse member I l. The frame 5| has a substantially L-shaped housing member 58 secured thereto, one portion of the housing member 53 being disposed in a substantially vertical position and secured to the frame 5| and the other portion of the housing member 58 being a roof or top and positioned above the frame 5|. Posts 59 are secured at the forward portion of the frame 5! and at the forward end of the housing member 53.

One form of power means for the boom i is shown in Figures 4- and and comprises an engine E having a transmission T of conventional construction and a drive shaft 60. The engine E is mounted on supporting members 6i which are secured to the frame 5! and the engine E is also provided with a clutch 62 between the engine E and the transmission T which clutch may be of any suitable construction. A clutch operating shaft 63 is operatively connected to the clutch 62 and an operating handle 64 is secured to the shaft 63 and is positioned closely adjacent a seat 65 mounted on a seat supporting member 66 which is positioned substantially in the transverse center of the frame 5|.

A driving pinion or gear 67 is secured to the drive shaft 69 and meshes with a driven gear 68 mounted on a drive shaft 69 rotatably carried by the frame M. The shaft 68 also has a grooved pulley or driving member 19 secured thereto about which flexible means H in the form of a belt, chain or other driving means is trained. A main drum driving shaft 72 is rotatably carried by the frame El and is provided with a pulley 13 about which the flexible member H is trained. The shaft if is provided at a point intermediate the ends thereof with a drum driving pinion or gear M which meshes with a relatively large gear l5 carried by a shaft E6. The shaft l6 has a pair of loading drums 29 and 29 loosely mounted thereon and the drum 29 has a clutch mechanism '5'! associated therewith and actuated by means of a clutch operator 1%. The drum 29* has a clutch "55 associated therewith and actuated by means of a clutch operator 8!). The shaft '55 is rotatably carried by bearings 85 and 82 which are fixed to the frame 5|. Clutch operator 18 includes a lever 83 which has connected thereto a link 84. The link 84 is connected to a rock lever 85 secured to a shaft 86 rockably carried by the frame 5! and an operating lever 8'! is fixed to the shaft 86.

In the present instance, the clutch ll is of the type which is normally spring pressed to an unclutching position and the clutch is moved to a clutching position by rotation of the lever 83. The clutch operating shaft or member 86 has a lever 88 fixed thereto which has one end of a link 89 connected therewith and the other end of the link 8% is connected to a lever or arm 96 fixed to a shaft 9!. The shaft 9! is rockably carried by the frame 5i and has an operating lever 92 secured thereto so that rocking of the lever 92 will effect operation of the clutch 19 which is normally spring pressed to a declutching position. The loading drum 29 has secured thereto a brake drum 93 about which a brake band 9 engages and this brake band 94 is operatively connected to a pedal or rock lever 95 rockably carried by a shaft 96. The loading drum 25 has a brake drum 9'! secured thereto and a brake band 93 engages about the drum 9? and is operatively connected to a pedal or rock lever 99.

The slew or swing drum &2 is rotatably mounted on a transversely disposed shaft ltd having a gear it)! fixed thereto which meshes with the gear 75. The drum 12 has a clutch Hi2 associated therewith which is actuated by means of non-rotatable cam member E03 and a rotatable cam member Hi l. The cam member Hi l is rocked by rocking of a lever I85 which is fixed thereto and is connected to one end of a link or tie rod Hit. The link or tie rod N36 is connected at the opposite end to a lever or arm [ill which is fixedly mounted on a rock shaft Hi8 extending transversely of the frame 5i and projects beyond the opposite sides thereof. A brake drum $09 is carried by the winding drum 32 and a brake band HE] is disposed thereabout and is connected to a brake operating lover or arm Ill. The arm iil is rocked by means of a rock lever H2 which is connected to one end of a link H3. The link H3 is connected. to a lever H4 carried by a sleeve H5 rotatably mounted on the shaft 98. An operating lever or pedal H6 is fixed to the sleeve H5 so that rocking of the pedal llil will effect contraction of the brake band iii].

The second swing or slew drum 45 is rotatably mounted on the opposite end of the shaft I85 and has associated therewith a clutch means i i? which is actuated by horizontal sliding movement of a non-rotatable operating member H8. A rotatable clutch operating member H9 is adapted to engage the slidable operating member H8 which is constructed in the form of a cam and lever l2ll is fixed to the operating member H8. A link i2! is connected at one end to the lever 52!? and at the opposite end to a rock lever E22 carried by the end of the shaft H13 opposite from the lever Mill. The cam members I I8 and l til are pitched oppositely from the cam members H33 and lot so that rocking of the shaft 68 in one direction will effect clutching of the clutching member 202 and rocking of the shaft m8 by the operating member i213 will effect clutching of the clutch ill and a declutching of the clutch 92. The drum 45 has a brake drum E26 fixed thereto about which a brake band I25 engages and this band is contacted by rocking of a shaft H26 having an operating lever l2! fixed thereto. The lever i2? is connected to one end of a link E28 and the opposite end of the link 923 is connected to a lever or arm H29 secured to a sleeve lSll. The sleeve litli has a pedal is! fixed thereto so that rocking of the pedal iii in one direction will contract the band i 25 and hold the drum 15 against rotation.

The heel drum or elevated member 28 is rotatably mounted on a shaft i552 and this shaft 532 has a relatively large gear H33 loose thereon which s fixed relative to the drum 23 and meshes with a driving pinion 33 i which is loose on the shaft '52. The pinion iii-l has associated therewith a clutch device 9-35 actuated by means of a clutch operating member 536 so that clutching of the clutch device l35 will operatlvely connect the shaft 532 with the shaft '82. The shaft 12 has a brake drum l3l fixed to one end thereof about which a brake band I38 engages and which is operatively connected to a rock lever I39 carried by a sleeve 540 which is mounted on the shaft Hi8. One end of the brake band I38 is held stationary by means of an outstanding bracket Ml which is fixed to one side of the frame 5|. The sleeve M0 is rocked by means of a pedal I42 which is positioned between the two pedals 95 and 99.

The heel or elevating drum 38 has a gear I43 fixed thereto and the drum 38 is loose on the shaft I32. A driving pinion M4 is loose on the shaft 52 and. has associated therewith a clutch device E45 which is operated by means of an operating member I46.

The drum 28 has secured to one side thereof a toothed ratchet member l4? and a rockable pawl M8 carried by shaft 549 is adapted to gravitatingly engage the ratchet l4! so as to hold the drum 28 against rotation in one direction. Preferably the pawl M8 holds the drum 28 against unwinding so that when the correct elevation of the boom Hi has been determined, the pawl hit may be swung to a locked position and thus hold the rear end of the boom ID in the selected elevated position.

The drum 33 has a ratchet I58 secured thereto and a pawl 555 is rocltably mounted on the shaft 649 and is adapted to hold the drum against rotation in one direction, preferably the unwinding of the drum 38.

In the use and operation of this device, the spar tree is initially topped in the usual manner and all of the branches cut off whereupon the boom member M has the rear or heel member placed in contacting relation with the spar tree with the tree 93 between the two side members i2. As the heel member is positioned forwardly of the rear ends of t e side members 22, the side members l2 will be held against lateral movement when the tree 53 is engaged with the heel member 39. The elevator drums 28 and 38 are initially operated to position the boom ill in the desired position with the boom either in a horizontal position or in a position inclined to the horizontal as shown in Figure 1. When this position has been determined, the drums 23 and 3,8 are locked against unwinding by the pawl member I48 and 55!. The drums 28 and 38 may be rotated together by clutching of the clutch devices I35 and 545 and the rotation of the drums 28 and 38 may be retarded by contracting of the brake band 38 at which time the clutch 82 is de-clutched by means of the clutch operating lever 64. The transmission T is conrolled by a shifting lever 52 so as to rotate the driving shaft 60 and the remaining shafts operatively con-- nected therewith at the desired speed.

The hook 32 is engaged with the log L adjacent one end thereof or at a point at one side of the longitudinal center so that when the winding rum 29 is rotated to wind the cable thereon, the log L will have its lower end lifted initially and this rear end will abut against the heel grid 29. When the log it engages the grid additional raising of the hook will lift the forward end of the log which may be held in either a horizontal position or any other desired position. After the log L has been raised, the boon ill may be swung horizontally by rotation of a selected swing or slew drum M or Assuming that the boom is to be to the right as viewed in Figures 2 and 3, the clutch operating members and IN are moved to a clutching position by rocking of the shaft its by means of the lever I23 in a clockwise direction.

At this time the clutch members H8 and H9 will be maintained in a de-clutching position so that the drum Md may rotate to unwind the 5 swing cable 43 as the cable 40 is being wound upon the drum 42. Gperation of the pedal H6 will effect contraction of the brake band llli so as to hold the drum 42 against rotation.

The rotation of the loading drum 29 is effected by rocking of the lever B! which will move clutch operating member iii to a clutching position so as to clutch the drum 29 through the gear id. The gear 15 is rotated at all times by the rotation of the gear 'M which is fixed to a shaft '12, the rotation of which is controlled by the main driving clutch and the transmission T.

Where a boom similar to that disclosed by Figure 3 is used, the swinging of the boom lb in one direction is effected by the winding of the cable 4t on the drum '52 and at this time the drum 45 is loose on the shaft similar to the shaft it'll. Swinging of the boom w in the opposite direction is effected by winding of the cable 35% on the drum 45* at which time the drum 62 is rotated to unwind the cable 46.

A boom constructed according to this invention when placed in actual operation has been found to greatly facilitate logging operations where the logging operations are performed either in conjunction with railroads or remote therefrom where the operations are carried on under conditions where only trucks and trailers are used to move the logs. With a boom constructed according to this invention it is possible to use internal combustion engines as a power means and to mount the engine or power device directly on the boom thereby providing an exceedingly compact logging device which can be loaded for moving on a truck and trailer, railroad car or may be even dragged along the ground for at least short distances.

The boom hereinbefore described can be placed in actual operation much quicker than a boom which is operated by a separate power device and can be used in hilly locations where it is difficult to mount a power device.

What I claim is:

1. spaced apart elongated members, necting members between said elc bers and positioned inwardly of th ends of elongated members, a heel mem inwardly of one end of said elongated members, a power element supporting frame over and disposed between the transverse l. n end of the boom, means for pivotaily ing the forward end of said frame to one of said transverse connecting members, an inter;' y threaded tubular member supported fron'i the rear end of said frame, means rockably and s elly connected to another of said ti sve connecting members and threadediy enga rig with said threaded member for adjusting the angular relation of the frame relative to the l earn.

2. In combination, a boom member comprising a pair of elongated spaced apart members, transverse connecting members between said elongated members and positioned inwardly of the ends of said elongated members, a heel member inwardly of one end of said elongated members, a frame disposed above said elongated members, means pivotally securing one end of said frame on said boom member, threaded adjusting means engaging said boom member and said frame to u adjust the angular relation of said frame relative to said boom member, and power means carried by said frame.

3. In combination, a boom member comprising a pair of spaced apart elongated members, a plurality of spaced. apart connecting members extending transversely between said elongated members, a plurality of parallel bars secured to certain of said transverse members between the ends of said elongated members, a frame member disposed above said boom member, means pivotally securing the forward end of said frame member to said boom member, and means connected to said frame and said boom member for vertically adjusting the opposite end of said frame relative to the boom member.

4. A boom comprising a pair of spaced apart elongated members, a plurality of transversely disposed connecting members connecting said elongated members together in spaced apart relation, a frame member disposed above said elongated members, means pivotally securing the forward end of said frame member to said elongated members, a substantially vertically disposed threaded member swivelly carried by one of said connecting members, a nut fixed to said frame threadably engaging said threaded member, and means carried by said frame for elevating said elongated members.

5. A boom comprising in combination an elongated boom member, a frame disposed above said boom member, means pivotally securing one end of said frame to said boom member, means engaging said boom and said frame for adjusting the angular relation of said frame relative to said boom member, a power member carried by said frame including means for raising the forward end of said boom, means for raising the rear end of said boom, and means for horizontally swinging said boom.

6. A boom comprising in combination a boom member including a pair of spaced apart elongated members, means securing said members together in spaced apart relation, said means being disposed inwardly of the opposite ends of said elongated members, a heel member extending transversely between said elongated members inwardly of one end thereof, a frame member above said boom member, means pivotally securing the forward end of said frame member to said boom member, means engaging said frame member and said boom member for adjusting the angular relation of said frame member relative to said boom member, a plurality of winding drums carried by said frame, means engaging certain of said drums and said boom for elevating said boom, and means engaging certain others of said drums for horizontally swinging said boom.

'7. A boom comprising in combination a boom member, a frame, means pivotally securing the forward end of said frame to said boom member, means engaging the rear end of said frame to adjust the angular relation of said frame to said boom member, an elevating drum rotatably carried by said frame, an elevating flexible member trained about said elevating drum and connected to the forward end of said boom, a second elevating drum journalled in said frame, a flexible elevating member wound about said second elevating drum and adapted to elevate the rear end of said boom member, a boom swinging drum rotatably carried by said frame, a boom swinging cable wound about said swinging drum, a sheave rotatably carried by said boom member adjacent the forward end thereof, said swing cable being trained through said sheave, a second swing drum rotatably carried by said frame, a second swing cable wound about said second swing drum, a second sheave rotatably carried by said boom member adjacent the forward end thereof, said second swing cable being trained through said second sheave, and means for rotating said drums.

8. A boom comprising in combination a boom member, a frame, means pivotally securing the forward end of said frame to said boom member, means engaging the rear end of said frame to adjust the angular relation of said frame to said boom member, an elevating drum rotatably carried by said frame, an elevating flexible member trained about said elevating drum and connected to the forward end of said boom, a second elevating drum journalled in said frame, a flexible elevating member wound about said second elevating drum and adapted to elevate the rear end of said boom member, a boom swinging drum rotatably carried by said frame, a boom swinging cable wound about said swinging drum, a sheave rotatably carried by said boom member adjacent the forward end thereof, said swing cable being trained through said sheave, a second swing drum rotatably carried by said frame, a second sheave rotatably carried by said boom member adjacent the rear end thereof, said second swing cable being trained through said second sheave and operable to swing said boom in a direction opposite from said first swing cable.

9. In combination, a boom member comprising a pair of spaced apart elongated members, a plurality of spaced apart connecting members ex tending transversely between said elongated members, a plurality of bars arranged between and disposed parallel to said elongated members, said bars having their end terminal portions secured to certain of said transverse members located between the ends of said elongated members, a frame member disposed above said boom member, means for pivotally securing the forward end of said frame member to another one of said connecting members rearwardly of the said certain connecting members, and frame adjusting means engaging the opposite end of said frame member and being rockably and swivelly connected to another one of said connecting members whereby to angularly adjust said frame member relative to said elongated members.

10. In a logging device, an angularly adjustable boom, a power element supporting frame mounted over the boom, means for pivotally connecting the forward end of said frame to the boom, supporting members connected to and extending rearwardly from said frame, an upstanding interiorly threaded tubular member suspended from said supporting members, and upstanding means rockably and swivelly connected to the boom and coacting with said threaded member for adjusting the angular relation of the frame of the frame with respect to the boom, said rotatable means being supported from the boom, and said tubular member and rotatable means con stituting a support for the rear end of the frame.

12. In a logging device, a suspended angularly adjustable boom, a horizontally disposed power element supporting frame mounted over the boom, means for supporting the outer end of the frame and for pivotally connecting such end to the boom, and a combined supporting and adjusting structure for the rear end of said frame, said structure being connected to the boom and to the rear end of the frame and including coacting parts acting on the rear end of the frame for adjusting the angular relation of the latter with respect to the boom.

GEORGE F. COATS. 

